Authors:

[Paul McCartney] never, at the time, was going back to leaning back on the roots of his old band. He always built upon where he was, which was in London. And he didn't overuse synthesizers. He used them just enough. It's such a cool sound.

"Bill Hader and Fred Armisen on making comedy cinematic with Documentary Now!". Interview with Gwen Ihnat, avclub.com. August 4, 2016.
[Paul McCartney] never, at the time, was going back to leaning back on the roots of his old band. He always built upon where he was, which was in London. And he didn't overuse synthesizers. He used them just enough.